exposed area : 28 phrases in 19 subjects |
Architecture | 1 |
Astronautics | 2 |
Aviation | 2 |
Cartography | 1 |
Ecology | 2 |
Electrical engineering | 2 |
Electronics | 1 |
Energy industry | 2 |
Firefighting and fire-control systems | 1 |
Gas processing plants | 1 |
General | 1 |
Informal | 2 |
Makarov | 3 |
Mathematics | 1 |
Metrology | 1 |
Military | 1 |
Nautical | 2 |
Technology | 1 |
Thermal engineering | 1 |